Re: [PATCH 2.6.24] x86: add sysfs interface for cpuid module

[H. Peter Anvin]

H. Peter Anvin wrote:
> dean gaudet wrote:
> > why do we need another kernel cpuid reading method when 
> > sched_setaffinity exists and cpuid is available in ring3?
>
> Because /dev/cpu/*/cpuid:
>
> a) predates sched_setaffinity by quite a few years
> b) is already widely used
> c) doesn't have issues with relative priorities (using sched_setaffinity
>    can easily wait forever.)
> d) can be accessed by unprivileged processes given appropriate device
>    info.

(a) and (b) obviously doesn't apply to the proposed sysfs hack; nor does 
it give the administrator the control given by (d).  The sysfs hack is 
pointless.

	-hpa
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